Operating Manual

8
systems or a GPS with vertical
GPS steering outputs.
Vertical Modes
When the autopilot is
engaged it will synchronize to
the direction and vertical speed
being flown at the time, the
lower right section of the
display shows SVS (selected
vertical speed). To enter
altitude hold at any time, push
and release the ALT button two
times.
If an altitude change is
desired, momentarily push and
release the ALT button and the
cursor will move over to the
selected vertical speed.
Rotation of the encoder
knob will now change the
selected vertical speed.
If the cursor is under the SVS
number a single click of the
ALT button will select zero
vertical speed. If the selected
vertical speed is set to zero, the
display will show:
Once the desired vertical
speed has been selected,
momentarily pushing and
releasing the MODE button will
move the cursor back to
SEL, or
after approximately seven
seconds without moving the
encoder, the cursor will move
back to SEL
.
If the autopilot is coupled to a
GPS or EFIS system which can
provide vertical GPS steering,
once in the GPSS mode,
pushing the ALT button will
enter the GPSV mode as well.
To use the GPSV mode with the
GNS 430/530/480, the aircraft
must be below the virtual glide
slope and the autopilot must be
in altitude hold. When
approach is initiated and the
CDI becomes active, the GPSV
button can then be pushed and
the unit will enter the GPSV
mode. The first screen will
show as below:
The screen will oscillate
between GPSV FLG and GPSS
HLD. When the VDI is no
longer flagged, the unit will